What technique involves using a thermal pressing comb twice on each side of the hair?

The technique that involves using a thermal pressing comb twice on each side of the hair is known as a hard press. This technique is specifically designed to create a very straight look on textured or curly hair by applying significant heat and pressure. Utilizing the comb twice on each side ensures that the hair is thoroughly straightened, reducing the chances of any curl or wave remaining.

A hard press is generally employed when seeking maximum straightness, often for special occasions or styles that require a sleek finish. It effectively helps in achieving a polished appearance by allowing the thermal comb to penetrate the hair shaft deeply and eliminate frizz or unwanted texture.

The other techniques mentioned, such as the soft press, medium press, or curl press, involve varying degrees of heat, pressure, or the incorporation of curls, which do not meet the requirements specified in the question regarding the use of the comb twice on both sides of the hair.